New translations en.json (Danish)

[ci skip]

website/src/locales/da.json

@@ -8,6 +8,7 @@
         "description": "View, edit, and create GPX files online with advanced route planning capabilities and file processing tools, beautiful maps and detailed data visualizations."
     },
     "menu": {
+        "new": "New",
         "new_file": "New file",
         "new_track": "New track",
         "new_segment": "New segment",